资源环境科技发展态势分析平台

The Cassini Visual and Infrared Mapping Spectrometer (VIMS) 5-mu m images are used to derive Saturn's global zonal winds around the 2,000-hPa level. The comparison of zonal winds between 2,000 and 300-500hPa shows a general consistency of wind structure between the two pressure levels on a global scale. However at some latitudes, the magnitude of the zonal winds differs between these levels. The equatorial zonal winds are stronger downward, while the zonal winds in the middle and high latitudes are generally weaker downward. These new wind measurements also imply that barotropic and baroclinic instabilities probably exist through the relatively deep atmosphere at some latitudes. Finally, our analysis reveals that the VIMS winds in the two polar regions are basically constant with time except for a westerly jet centered at similar to 88 degrees N, which decreased from 135 +/- 7 m/s in 2008 to 91 +/- 12 m/s in 2017.